How can PHP be integrated with VPN technology to create a more secure router login system?

To integrate PHP with VPN technology for a more secure router login system, you can use PHP to authenticate users based on their VPN connection. This ensures that only users connected to the VPN can access the router login page, adding an extra layer of security.

<?php
// Check if user is connected to VPN
if ($_SERVER['REMOTE_ADDR'] != 'VPN_IP_ADDRESS') {
    header('HTTP/1.0 403 Forbidden');
    exit('Access denied. Please connect to the VPN to access this page.');
}

// Proceed with router login code
// ...
?>